Here is the output for a five director Yagi cut for the center of the H-VHF band. This would be similar to an Antennacraft Y5713 or Y10713.

Construction is assumed to be based on a 1" square metal tube boom and 3/8" round tubing for the elements. The directors and driven element are not insulated from the boom. (The driven element is a folded dipole. Its' center point opposite the feed point contacts the boom.)

Here's yet another design. This is specifically designed to use 1" square metal tube as the main boom, #8 AWG solid wire as the element material. The reflector, directors and center point opposite the feed point gap in the folded dipole all are in direct contact with the boom (no insulators are used in the design except possibly at the feed point if the foleded dipole needs to be supported at the gap/terminals).